The default Hot Keys to convert to the standard Sales Transaction Types are:
Sales Invoice - [Ctrl]+[I]
Layaway - [Ctrl]+[L]
Sales Order - [Ctrl]+[O]
Quote - [Ctrl]+[Q]
On Hold - [Ctrl]+[H]
Rental - [Ctrl]+[R]
Gift Registry - [Ctrl]+[G]
Special Order - [Ctrl]+[S]
Service Order - [Ctrl]+[E]
Recurring Charge - [Ctrl]+[U]
See:
Sales Manager Contents